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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
Jul. 26, 2018
Mar. 15, 2017
Mar. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]        
Amount awarded to other party in settlement $ 1,000      
Issuance of common shares in litigation settlement (in shares) 500,000      
Additional amount to be awarded to other party in settlement, within 12 months $ 1,000      
Additional amount to be awarded to other party in settlement, within 24 months $ 1,000      
Acquisition-related liabilities     $ 1,000 $ 1,000
Acquisition-related liabilities, current     1,000  
Acquisition-related liabilities, noncurrent     $ 1,000  
Former Stockholders        
Loss Contingencies [Line Items]        
Stock issued for acquisition (shares)   973,333